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x in (-oo:+oo)
-41 = 7*x-(2*x)+9 // - 7*x-(2*x)+9
2*x-(7*x)-41-9 = 0
2*x-7*x-41-9 = 0
-5*x-50 = 0 // + 50
-5*x = 50 // : -5
x = 50/(-5)
x = -10
x = -10
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